<!DOCTYPE html>
<html>

<head>
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <title>Page Title</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <script src="https://cdn.jsdelivr.net/npm/vue/dist/vue.js"></script>

</head>
<style>
    .list-complete-item {
        transition: all 1s;
        display: inline-block;
        margin-right: 10px;
    }
    
    .list-complete-enter,
    .list-complete-leave-to
    /* .list-complete-leave-active for below version 2.1.8 */
    
    {
        opacity: 0;
        transform: translateY(30px);
    }
    
    .list-complete-leave-active {
        position: absolute;
    }
</style>

<body>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.14.1/lodash.min.js"></script>

    <div id="list-complete-demo" class="demo">
        <button v-on:click="shuffle">Shuffle</button>
        <button v-on:click="add">Add</button>
        <button v-on:click="remove">Remove</button>
        <transition-group name="list-complete" tag="p">
            <span v-for="item in items" v-bind:key="item" class="list-complete-item">
        {{ item }}
      </span>
        </transition-group>
    </div>
</body>
<script>
    new Vue({
        el: '#list-complete-demo',
        data: {
            items: [1, 2, 3, 4, 5, 6, 7, 8, 9],
            nextNum: 10
        },
        methods: {
            randomIndex: function() {
                return Math.floor(Math.random() * this.items.length)
            },
            add: function() {
                this.items.splice(this.randomIndex(), 0, this.nextNum++)
            },
            remove: function() {
                this.items.splice(this.randomIndex(), 1)
            },
            shuffle: function() {
                this.items = _.shuffle(this.items)
            }
        }
    })
</script>

</html>